On Thu, 10 May 2012 19:44:31 +0200 Piergiorgio Sartor <piergiorgio.sartor@xxxxxxxx> wrote: > Hi, > > again, following the RAID-5 story, I was wondering > if could make sense to have a new superblock type, > let's say 2.x, having backup copies (of persistent > or quasi persistent data) in different areas of the > drive components. > This would be similar to filesystem or gpt. > > Is there anything planned for this? This is one of the idea that has floated around in my head for a while, possibly a v1.3 metadata. However my thought there was always to protect against a bad block on the device. Protecting against data corruption due to bugs or sys-admin mistakes is always best handled by backups. e.g. take a 'dump' (either binary or textual) of the metadata every day, or every reboot or something. (And store it on a different host). Both are probably useful, but for the recently problem, a regular backup would be the most useful. > > In any case, it would be still interesting to have > a "backup" capability at hand, like a "dd" of the > superblock to some secure file. "mdadm -E" would probably be enough - just write a cron job :-) NeilBrown > > Any idea or suggestions? > > Thanks, > > bye, >
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